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Preparation, Purification, and Use of Fatty Acid-containing Liposomes
Published on: February 9, 2018
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Gene-Directed FtsZ Ring Assembly Generates Constricted Liposomes with Stable Membrane Necks
Elisa Godino1, Christophe Danelon1
1Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, Delft, 2629HZ, The Netherlands.
Advanced Biology
|January 2, 2023
Summary
Synthetic cell division using FtsZ proteins formed cytoskeletal structures and constricted liposomes. However, the FtsZ-FtsA system failed to achieve complete cell abscission, indicating overly stable proto-rings.
Area of Science:
- Synthetic biology
- Biochemistry
- Microbiology
Background:
- Bacterial cell division is a complex process involving cytoskeletal proteins.
- FtsZ polymers are key components in bacterial cytokinesis.
- Cell-free systems offer a simplified approach to study minimal requirements for cell division.
Purpose of the Study:
- To investigate the minimal protein requirements for bacterial cell division using a cell-free system.
- To determine if FtsZ and FtsA are sufficient for complete cell division, including abscission.
- To analyze the stability of FtsZ-based structures in membrane constriction.
Main Methods:
- Utilized purified FtsZ and FtsA (or FtsA*) proteins expressed via the PURE system from a DNA template.
- Reconstituted systems with liposomes to mimic cell division.
- Employed fluorescence microscopy for long-time tracking of liposome behavior.
- Manipulated external solution osmolarity to test its effect on division.
Main Results:
- Successfully formed FtsZ-based cytoskeletal structures on liposomes.
- Observed constriction of liposomes, resulting in budded structures of various morphologies.
- Constricted liposomes remained attached via narrow membrane necks; complete abscission was not achieved.
- Increased external osmolarity did not induce division.
Conclusions:
- The FtsA-FtsZ proto-rings formed in this reconstituted system are too stable to allow for membrane abscission.
- Achieving synthetic cell division requires additional mechanisms beyond FtsZ-based constriction.
- Further research should explore complementary systems to facilitate abscission in synthetic cell division.
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